Machine for mixing and treating plastic substances.



No. 851,607. PATENTED APR. 23, 1 907.

' F. I. DU PONT.

MAGHINE FOR MIXING AND TREATING PLASTIC SUBSTANCES.

APPLICATION FILED MAB. 9, 1904.

2 SHEETS-SHEET 1.

WITNESSES: INVENTIJH 151212015; I. dwRm;

A W MlMi-r .Nq. 851,607. PATENTED APR. 23, 1907.

P. DU P-ONT.

MACHINE FOR MIXING AND TREATING PLASTIC SUBSTANCES.

APPLICATION FILED MAB. 9, 1904.

2 SHEETS-SHEET 2 WITNESSES: mvewron 2%, Framed 1. duPont UN TED STATES PATENT OFF-ICE. FRANCIS I. DU PONT, OF WIITMTNGTON, DELAWARE.

MACHINE FOR MIXING AND TREATING PLASTIC SUBSTANCES- Patented April 23, 1907.

Application filed March 9, 1904. Serial No. 197,226.

' following is a full, clear, and exact description, reference being had to the accompanying drawings, which form a part of this specification.

Myinvention has for its object the production of a machine which will effectually and thoroughly mix, disintegrate and com ress plastic substances. Speaking generall I attainthis object by the use of a plurality of rolls provided on their periphery with rojecting teeth, preferably sharp pointe or saw teeth, the rolls being in proximity to each other and the teeth on the rolls intermeshing with each other. The rollsare also caused to revolve at different rates of speed. The casing in which these rolls revolve is also provided with curved ortions concentric to the rolls and of slight y greater radius than the apex of the teeth, so that at thisportion of the revolution of the rolls the teeth approach closely to the casing. By this arrangement, the material acted on by the rolls is being continually disintegrated by being drawn between the rolls. It is then carried by the rolls between their surfaces and the curved surfaces of the casing so that it is compressed and rolled into lumps against the curved portion of the casing in dlscharging or throwing ofl the mass.

My invention also consists in various details of construction which will hereinafter be more fully described.

In the drawings :Figure l is a sectional plan view of the machine taken on the line 11 Fig. 2. r Fig. 2 is a side elevation of the machine. Fig. 3 is a transverse sectional view taken on the line 3 3, Fig. 1. Fig. 4 is a longitudinal sectional view taken on the line 4-4 Fig. 3.

The casing of the machine is formed of the parts D, F and G. The portion D is formed curved, as shown at d, and is provided with the flange d, which rests upon and is secured by bolts 0 to the tank, castin or. base E. e

is an inlet pipe to this tank and e an outlet from said tank. The purpose of this tank and its inlet and outlet is to provide a circulation of water or other coohng liquid for the purpose to be hereinafter fully destances to be treated b scribed. The section or portion F is flanged at the top and bottom. It is secured by bolts f to the flange of the portion D. .-..he top portion G is provided with a flange at its lower end and through which and the upper flange of the portion F bolts 9 pass to secure the two sections together.

A, A are two rolls having, respectively, the shafts B, B. These shafts are carried in journals 1), b, respectively, formed with the casing and in which are the stuffing boxes 0. The lower half or portion of the journals for the shaft of each roll is formed integral with the ortion D of the casing, while the upper haf of the 'ournals for each roll is formed integral wit portion F of the casin Upon the periphery of the 'roll A are teet a, and upon the eriphery of roll A are teeth a. The teeth upon one roll are out of alinement of the teeth on the-other roll, and the rolls are in such position with reference to each other that the teeth of the two rolls intermesh. The teeth are preferably ointed or saw teeth. The rolls are so place that the teeth revolve in proximity to the curved portions of the casing D, the radius of each curved portion being slightly greater than the radius of the apices of the teeth.

The top section G has a chargin opening g which is fitted with a cover H. I t has also a dischar 'ng opening 9 which is fitted with a hinged 001' I, said door having the pivoted locking pieces '11, which fit in recesses q. in the casing G.

Upon the shaft B is the gear J and upon the shaft 13 meshing with 'gear J is the gear K.

L are two 1pulleys, one loose, the other fast upon shaft the first .pulley being driven by a belt not shown Preferably, to obtain.the best results, the gears. J and K have different diameters so that the shafts B and B, and their corresponding rolls A and A revolve at different speeds.

Owing to the nature of'a number of subthe machine the casing is made closed an practically air-tight. In man cases also, While in course of treatment of the; material under the action of the rolls, considerable heat is'produced, and, to overcome this and to keep the temperature low, I constantly circulate throu h the tank E water, or a coolin liquid, w 'ch enters through, inlet e an passes out through outlet e.

In the operation of the machine, the mate'- rial to be treated is charged Into the lnterior of the casing through the char 'ng opening g until it is filled to about in me wlth the discharging o ening.- The rolls are then revolved towarm each other, thus drawing the material between them and around in contact 'with the curved surfaces (1 and discharges it at the outer side of the rolls. The :action I obtain-is that of tearing the material -apartyordisintegrating it, andpressin it toether, somewhat similar to the action of eading. By this action the liquid, which generally forms a 'part of 'the mixture is thoroughly and in'timately admixed through out all parts of the material, and the-mate- 'rial will bedischar ed from-the rolls'formed into lum sof consi erable size. This last result-is o tained in a great measure by the rolling-effect of the material between the rolls and the curved portions d. Practically the material is disintegrated in passingbetween the rolls and is then formed into lumps of considerable size in its'passage between the rolls and the curved portions (1.

-The teeth a and a are made preferably sharp, -or like saw-teeth, in order to thoroughly disintegrate the material in passing between the rolls.

Having now fully described my invention, What I claimand desire to protect by Letters Patent is 1. Ina machine of the character described, in combination, an air tight casing adapted; to receive the material to be treated, coacting rolls having disintegratin surfaces insaid casing, there being curve portions of the casin conforming to a ortion o f-the periphery o' the rolls, the rolls iaving a portion above and a portion adjacent to the curved casing ortions, and means to revolve said rolls, w iereby the material in the casing is disintegrated by passing between the rolls and carried between the rolls and curved casing surfaces, and meansto maintain the material in the casing at a-low temperature.

2. In a machine of the character described, in combination, an air tight casing adapted-to-receive the material to be treated, coacting rolls having disintegratin sur- In testimony of which invention, I have hereunto set my hand, at Wilmington, on this 29th day of February, 1904.

FRANCIS I. DU FONT. Witnesses:

HENRY DRURY, D. M. MACDONALD. 

